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Finding the Fourth Proportional to 8,677.80, 11,978.16 and 6,438.96

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Solution

The fourth proportional to 8,677.80, 11,978.16 and 6,438.96 is: 8,887.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,677.80 : 11,978.16 = 6,438.96 : x
  2. Step 2: Convert to fraction form
    8,677.80/11,978.16 = 6,438.96/x
  3. Step 3: Cross multiply
    8,677.80x = 11,978.16 × 6,438.96
  4. Step 4: Simplify right side
    8,677.80x = 77,126,893.11
  5. Step 5: Solve for x
    x = 77,126,893.11/8,677.80
  6. Step 6: Final answer
    x = 8,887.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.